[release] Prepare release Exporter.OneCollector-1.13.0 (#3311)

Signed-off-by: otelbot <[email protected]>
Co-authored-by: otelbot <[email protected]>

Author: otelbot-dotnet-contrib[bot]

src/OpenTelemetry.Exporter.OneCollector/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+## 1.13.0
+
+Released 2025-Oct-24
+
 * Updated OpenTelemetry core component version(s) to `1.13.1`.
   ([#3218](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/3218))